2 papers
math.AT2001
Rational homotopy theory and nonnegative curvature
Jianzhong Pan
In this note, we answer positively a question by Belegradek and Kapovitch about the relation between rational homotopy theory and a problem in Riemannian geometry which asks that t…
math.AT1999
Forgetable map and phantom maps
Pan Jianzhong, Woo Moo Ha
In this note, we attack a question posed ten years ago by Tsukiyama about the injectivity of the so- called Forgetable map. We show that we can insert the Forgetable map in an exac…